【Key words】 soil moisture variation; gully land; wind-water erosion crisscross region; Loess Plateau in China
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研究黄土高原土壤水分变化规律，有着极其重要的科学和实际意义。
That has practical and scientific significance to study the dynamic law of soil moisture.
徐炳成山仑李凤民，苜蓿与沙打旺苗期生长和水分利用对土壤水分变化的反应。
Responses of Medicago sativa and Astragalus adsurgens seedlings growth and water use to soil moisture regime.
基于土壤水分变化率与贮水量成正比这一假定，得出了土壤水分的指数消退关系。
Based on an assumption that the depletion of soil water is proportional to soil water storage, the exponential depletion relation of soil water is obtained.
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